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Fayer-Hosken، RA؛ HJ Bertschinger؛ JF Kirkpatrick؛ D Grobler؛ N Lamberski؛ G Honneyman؛ T Ulrich (1999). "Contraceptive potential of the porcine zona pellucida vaccine in the African elephant (Loxodonta africana)". Theriogenology. ج. 52 ع. 5: 835‚Äì846. DOI:10.1016/s0093-691x(99)00176-4. PMID:10735124.